package com.ggx.voicereminder.record;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.media.AudioFormat;
import android.media.AudioRecord;

import com.ggx.voicereminder.util.Constant;
import com.ggx.voicereminder.util.ErrorCode;


public class AudioRecordWay {

	// 缓冲区字节大小 
	private int						bufferSizeInBytes	= 0;

	//AudioName裸音频数据文件 ，麦克风
	private String					AudioName			= "";

	//NewAudioName可播放的音频文件 
	private String					NewAudioName		= "";

	private AudioRecord				audioRecord;
	private boolean					isRecord			= false;	// 设置正在录制的状态 

	private static AudioRecordWay	mInstance;

	public AudioRecordWay() {

	}

	public synchronized static AudioRecordWay getInstance() {
		if (mInstance == null)
			mInstance = new AudioRecordWay();
		return mInstance;
	}

	public int startRecordAndFile() {
		//判断是否有外部存储设备sdcard
		if (AudioFile.isSdcardExit()) {
			if (isRecord) {
				return Constant.RECORD_STATE_RECORDING;
			}
			else {
				if (audioRecord == null)
					creatAudioRecord();

				audioRecord.startRecording();
				// 让录制状态为true 
				isRecord = true;
				// 开启音频文件写入线程 
				new Thread(new AudioRecordThread()).start();

				return ErrorCode.ERROR_SUCCESS;
			}

		}
		else {
			return ErrorCode.ERROR_NO_SDCARD;
		}

	}

	public void stopRecordAndFile() {
		close();
	}

	public long getRecordFileSize() {
		return AudioFile.getFileSize(NewAudioName);
	}

	private void close() {
		if (audioRecord != null) {
			System.out.println("stopRecord");
			isRecord = false;//停止文件写入 
			audioRecord.stop();
			audioRecord.release();//释放资源 
			audioRecord = null;
		}
	}

    private void creatAudioRecord() { 
        // 获取音频文件路径
        AudioName = AudioFile.getRawFilePath();
        NewAudioName = AudioFile.getWavFilePath();
         
        // 获得缓冲区字节大小 
        bufferSizeInBytes = AudioRecord.getMinBufferSize(AudioFile.AUDIO_SAMPLE_RATE, 
                AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT); 
         
        // 创建AudioRecord对象 
        audioRecord = new AudioRecord(AudioFile.AUDIO_INPUT, AudioFile.AUDIO_SAMPLE_RATE, 
                AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeInBytes); 
    }
     
     
    class AudioRecordThread implements Runnable { 
        @Override 
        public void run() { 
            writeDateTOFile();//往文件中写入裸数据 
            copyWaveFile(AudioName, NewAudioName);//给裸数据加上头文件 
        } 
    } 
   
    /**
     * 这里将数据写入文件，但是并不能播放，因为AudioRecord获得的音频是原始的裸音频，
     * 如果需要播放就必须加入一些格式或者编码的头信息。但是这样的好处就是你可以对音频的 裸数据进行处理，比如你要做一个爱说话的TOM
     * 猫在这里就进行音频的处理，然后重新封装 所以说这样得到的音频比较容易做一些音频的处理。
     */ 
    private void writeDateTOFile() { 
        // new一个byte数组用来存一些字节数据，大小为缓冲区大小 
        byte[] audiodata = new byte[bufferSizeInBytes]; 
        FileOutputStream fos = null; 
        int readsize = 0; 
        try { 
            File file = new File(AudioName); 
            if (file.exists()) { 
                file.delete(); 
            } 
            fos = new FileOutputStream(file);// 建立一个可存取字节的文件 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
        while (isRecord == true) { 
            readsize = audioRecord.read(audiodata, 0, bufferSizeInBytes); 
            if (AudioRecord.ERROR_INVALID_OPERATION != readsize && fos!=null) { 
                try { 
                    fos.write(audiodata); 
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
            } 
        } 
        try {
            if(fos != null)
                fos.close();// 关闭写入流 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
   
    // 这里得到可播放的音频文件 
    private void copyWaveFile(String inFilename, String outFilename) { 
        FileInputStream in = null; 
        FileOutputStream out = null; 
        long totalAudioLen = 0; 
        long totalDataLen = totalAudioLen + 36; 
        long longSampleRate = AudioFile.AUDIO_SAMPLE_RATE; 
        int channels = 2; 
        long byteRate = 16 * AudioFile.AUDIO_SAMPLE_RATE * channels / 8; 
        byte[] data = new byte[bufferSizeInBytes]; 
        try { 
            in = new FileInputStream(inFilename); 
            out = new FileOutputStream(outFilename); 
            totalAudioLen = in.getChannel().size(); 
            totalDataLen = totalAudioLen + 36; 
            WriteWaveFileHeader(out, totalAudioLen, totalDataLen, 
                    longSampleRate, channels, byteRate); 
            while (in.read(data) != -1) { 
                out.write(data); 
            } 
            in.close(); 
            out.close(); 
        } catch (FileNotFoundException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
   
    /**
     * 这里提供一个头信息。插入这些信息就可以得到可以播放的文件。
     * 为我为啥插入这44个字节，这个还真没深入研究，不过你随便打开一个wav
     * 音频的文件，可以发现前面的头文件可以说基本一样哦。每种格式的文件都有
     * 自己特有的头文件。
     */ 
    private void WriteWaveFileHeader(FileOutputStream out, long totalAudioLen, 
            long totalDataLen, long longSampleRate, int channels, long byteRate) 
            throws IOException { 
        byte[] header = new byte[44]; 
        header[0] = 'R'; // RIFF/WAVE header 
        header[1] = 'I'; 
        header[2] = 'F'; 
        header[3] = 'F'; 
        header[4] = (byte) (totalDataLen & 0xff); 
        header[5] = (byte) ((totalDataLen >> 8) & 0xff); 
        header[6] = (byte) ((totalDataLen >> 16) & 0xff); 
        header[7] = (byte) ((totalDataLen >> 24) & 0xff); 
        header[8] = 'W'; 
        header[9] = 'A'; 
        header[10] = 'V'; 
        header[11] = 'E'; 
        header[12] = 'f'; // 'fmt ' chunk 
        header[13] = 'm'; 
        header[14] = 't'; 
        header[15] = ' '; 
        header[16] = 16; // 4 bytes: size of 'fmt ' chunk 
        header[17] = 0; 
        header[18] = 0; 
        header[19] = 0; 
        header[20] = 1; // format = 1 
        header[21] = 0; 
        header[22] = (byte) channels; 
        header[23] = 0; 
        header[24] = (byte) (longSampleRate & 0xff); 
        header[25] = (byte) ((longSampleRate >> 8) & 0xff); 
        header[26] = (byte) ((longSampleRate >> 16) & 0xff); 
        header[27] = (byte) ((longSampleRate >> 24) & 0xff); 
        header[28] = (byte) (byteRate & 0xff); 
        header[29] = (byte) ((byteRate >> 8) & 0xff); 
        header[30] = (byte) ((byteRate >> 16) & 0xff); 
        header[31] = (byte) ((byteRate >> 24) & 0xff); 
        header[32] = (byte) (2 * 16 / 8); // block align 
        header[33] = 0; 
        header[34] = 16; // bits per sample 
        header[35] = 0; 
        header[36] = 'd'; 
        header[37] = 'a'; 
        header[38] = 't'; 
        header[39] = 'a'; 
        header[40] = (byte) (totalAudioLen & 0xff); 
        header[41] = (byte) ((totalAudioLen >> 8) & 0xff); 
        header[42] = (byte) ((totalAudioLen >> 16) & 0xff); 
        header[43] = (byte) ((totalAudioLen >> 24) & 0xff); 
        out.write(header, 0, 44); 
    }  
}
